CN111600056A - Preparation method of energy storage composite material structure battery - Google Patents
Preparation method of energy storage composite material structure battery Download PDFInfo
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- CN111600056A CN111600056A CN202010411239.3A CN202010411239A CN111600056A CN 111600056 A CN111600056 A CN 111600056A CN 202010411239 A CN202010411239 A CN 202010411239A CN 111600056 A CN111600056 A CN 111600056A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 44
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000000465 moulding Methods 0.000 claims abstract description 27
- 239000011267 electrode slurry Substances 0.000 claims abstract description 12
- 238000003475 lamination Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000006261 foam material Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 20
- 239000004917 carbon fiber Substances 0.000 claims description 20
- 239000003792 electrolyte Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000001723 curing Methods 0.000 claims description 13
- 239000006260 foam Substances 0.000 claims description 10
- 239000011149 active material Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000006258 conductive agent Substances 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004880 explosion Methods 0.000 abstract description 2
- 238000007731 hot pressing Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000002003 electrode paste Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- 238000003892 spreading Methods 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 210000003537 structural cell Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/045—Cells or batteries with folded plate-like electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a preparation method of a battery with an energy storage composite material structure, which comprises the following steps: (1) preparing electrode slurry, (2) coating the electrode slurry on a current collector, (3) drying, rolling and slicing the coated current collector to prepare an electrode plate, (4) placing the electrode plate on two sides of a diaphragm to perform Z-shaped lamination to prepare a cell, (5) preparing a shell by using prepreg and foam materials, then forming a sandwich structure in the shell in which the cell is placed, (6) performing hot-pressing composite molding by using a molding press, (7) injecting electrolytic liquid, and (8) sealing and testing. The battery prepared by the method integrates energy storage and structure, reduces the weight of the energy storage element while keeping the original power density, increases the space utilization rate, provides good mechanical property, increases the explosion resistance of the energy storage element when the energy storage element is pressed or pulled, and improves the safety of the energy storage element.
Description
Technical Field
The invention belongs to the field of energy storage materials, and particularly relates to a preparation method of a battery with an energy storage composite material structure.
Background
With the rapid development of mobile power technologies such as portable electronic devices and electric vehicles, energy storage systems with higher weight and volume efficiency are also sought. The traditional energy storage system has large volume, heavy weight, poor corrosion resistance, easy damage and relatively short service life, and is greatly limited in application in industry. In recent years, a new research field, namely a structural energy storage composite material, is developed by the multifunctional composite material, the structural energy storage composite material is a material integrating structure and energy storage, the excellent mechanical property of the composite material and the energy storage property of the energy storage material can be combined into a single structure, and the weight and the volume of an energy storage element can be obviously reduced.
Disclosure of Invention
The invention aims to provide a structural battery aiming at the defects of large volume, heavy weight, poor pressure resistance and the like of the traditional energy storage element, the battery integrates energy storage and structure, reduces the weight of the energy storage element while keeping the original power density, increases the space utilization rate, provides good mechanical property, increases the explosion resistance of the energy storage element when the energy storage element is pressed or pulled, and improves the safety of the energy storage element.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a battery with an energy storage composite material structure comprises the following steps:
(1) preparing electrode slurry: mixing the active material, the conductive agent and the binder according to the mass ratio of 9:0.5:0.5, and then adding the solvent and fully stirring to uniformly mix the active material, the conductive agent and the binder;
(2) coating: coating the uniformly mixed electrode slurry on a current collector to prepare a positive electrode plate and a negative electrode plate;
(3) drying, rolling and slicing: putting the coated positive electrode plate and negative electrode plate into a vacuum drying oven for drying, then rolling, and finally shearing into electrode plates with proper sizes;
(4) preparing an electric core: the positive electrode plate and the negative electrode plate are symmetrically arranged on two sides of the diaphragm, and the Z-shaped layers are laminated to form a battery cell which comprises the positive electrode plate, the negative electrode plate, the diaphragm, a positive electrode pin and a negative electrode pin;
(5) preparing a sandwich structure: preparing a shell by using prepreg and foam material, and then putting the prepared battery cell into the shell to form a sandwich structure;
(6) curing and forming: placing the assembled sandwich structure in a molding press for curing and molding;
(7) electrolyte injection: placing the cured and molded structure in a glove box and injecting electrolyte;
(8) sealing and testing: after the electrolyte is injected, the injection port is sealed, and the electrochemical performance of the electrolyte is tested by using an electrochemical workstation.
Further, in the step (2), the current collector is 4mol/L H for aluminum foil or nickel foil with the thickness of 0.01mm2SO4Vacuum corroding in the solution at 25 deg.C for 30 min.
Further, in the step (2), the electrode slurry is coated on the current collector to a thickness of 50-300 μm.
Further, the rolling pressure in the step (3) is 35 MPa.
Further, in the step (5), a carbon fiber prepreg or a glass fiber prepreg is used as the prepreg, and preferably, a carbon fiber prepreg is used.
Further, the thickness of the carbon fiber prepreg is 0.02 mm.
Further, the carbon fiber prepreg is composed of carbon fiber woven cloth and epoxy resin.
Further, the specific manufacturing method of the sandwich structure in the step (5) comprises the following steps: placing a rectangular frame around the prepared battery cell, wherein the thickness of the frame is equal to that of the battery cell in the Z-shaped lamination direction, and prefabricating a liquid injection hole in front of a foam frame; and then laying layers on the upper surface and the lower surface of the cell in the Z-shaped lamination direction by using 0.02mm carbon fiber prepreg to form an upper panel and a lower panel, wherein the upper panel and the lower panel are formed by combining the foam frame and the cell in the Z-shaped lamination direction by using the carbon fiber prepreg, so that the whole preform with a sandwich structure is formed.
Further, the curing and forming in the step (6) specifically comprises the following steps: placing the sandwich structure assembled in the step (5) on a molding press, and setting the pressure of the molding press to be 0.1 MPa; raising the temperature of the molding press to 85 ℃, and keeping the temperature for 10 min; and raising the temperature of the molding press to 120 ℃, preserving the heat for 15min, and taking out after the molding press is naturally cooled.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the structural battery composite material shell, the ultrathin carbon fiber prepreg is adopted for layering, resin can be fully soaked among carbon fibers during curing and forming, and the cured and formed composite material shell has fewer defects and better mechanical property.
2. According to the invention, the ultrathin carbon fiber prepreg is directly layered on the battery core, so that the carbon fiber prepreg and the battery core are directly compounded into a whole, and the battery has better mechanical performance, and a battery sheet is not embedded in a composite material sandwich plate to prepare a structural battery, so that unnecessary load is reduced. The structural battery prepared by the method can keep a complete shape under the load of 1200N, does not generate cracks and electrolyte overflow phenomena, and still has good charge and discharge performance.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a battery with an energy storage composite structure according to the present invention;
FIG. 2 is a schematic structural diagram of an electrode plate of a battery with an energy storage composite material structure according to the invention;
fig. 3 is a schematic structural diagram of a cell of the energy storage composite material structure battery of the invention;
FIG. 4 is a schematic structural diagram of a battery with an energy storage composite structure according to the present invention;
in the figure: 1. an electrode pin; 2. riveting; 3. a current collector; 4. electrode paste; 5. a positive electrode pin; 6. a negative electrode pin; 7. a positive electrode plate; 8. a diaphragm; 9. a negative electrode plate; 10. a liquid injection hole; 11. a lower panel; 12. a frame; 13. and a top panel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a preparation method of a battery with an energy storage composite material structure, and referring to fig. 1, the preparation method comprises the following specific steps:
(1) preparing electrode slurry: mixing the active material, the conductive agent and the binder according to the mass ratio of 9:0.5:0.5, adding a proper amount of solvent, and uniformly stirring; in the embodiment, the activated carbon, the conductive carbon black and the PVDF are mixed according to the mass ratio of 9:0.5:0.5, and then an appropriate amount of NMP solution is added to be fully stirred, so that uniformly mixed sticky slurry is obtained.
(2) Coating: coating the uniformly mixed electrode slurry on a current collector 3; this example uses an aluminium foil with a thickness of 0.01mm as current collector, which is placed under vacuum at 25 ℃ with 4mol/L H before coating2SO4The solution was etched for 30min, and the electrode slurry was coated on an aluminum foil to a thickness of 200 μm. The aluminum foil current collector adopted for preparing the electrode plate is further corroded by chemical reagents, and the surface of the current collector is provided with an uneven structure, so that the electrode active material and the current collector are bonded more firmly.
(3) Drying, rolling and slicing: putting the coated electrode slice into a vacuum drying oven for drying, then rolling, and finally shearing into an electrode slice with a proper size; in the embodiment, the coated electrode slice is placed in a vacuum drying oven for vacuum drying for 12 hours at the temperature of 120 ℃; placing the dried electrode slice on a roller press, and pressing by adopting 35MPa pressure to ensure that the surface electrode slurry 4 and the current collector 3 are tightly adhered together; the electrode sheet is cut to an appropriate size as needed, and the electrode pin 1 and the current collector 3 are riveted together with the rivet 2 on the electrode sheet, as shown in fig. 2. The electrode pin 1 is a copper sheet with the thickness of 0.1 mm.
(4) Preparing an electric core: placing the positive plate and the negative plate symmetrically on two sides of the insulating diaphragm, and laminating the Z-shaped layers to form a battery cell as shown in figure 3; the battery cell comprises a positive electrode pin 5, a negative electrode pin 6, a diaphragm 8, a positive electrode plate 7 and a negative electrode plate 9; in the embodiment, the prepared positive electrode plate 7 and the negative electrode plate 9 are folded in a Z shape and then are symmetrically arranged on two sides of the diaphragm 8; the membrane 8 used in this example was a cellulose membrane TF40-30, having a thickness of 30 μm and a porosity of 49%.
(5) Preparing a sandwich structure: prepare the casing with preimpregnation material and foam material, put into the casing with the electric core that prepares and constitute sandwich structure, the concrete process is: placing a rectangular frame 12 (rectangular foam) around the prepared battery core, wherein the thickness of the foam is equal to that of the battery core in the Z-shaped lamination direction, and prefabricating a liquid injection hole 10 on the frame 12; and then laying layers on the upper surface and the lower surface of the cell Z-shaped lamination direction by using carbon fiber prepreg with the thickness of 0.02mm to form an upper panel 13 and a lower panel 11, wherein the upper panel 13 and the lower panel 11 formed by combining the frame 12 and the cell Z-shaped lamination direction are completely covered by the carbon fiber prepreg. Thereby forming an integral preform of a sandwich construction.
(6) Curing and forming: placing the assembled sandwich structure in a molding press for curing and molding; in the embodiment, the sandwich structure is placed in a molding press, the pressure of the molding press is adjusted to 0.1MPa, the temperature of the molding press is firstly increased to 85 ℃, and the temperature is kept for 10 min; and raising the temperature of the molding press to 120 ℃, preserving the heat for 15min, closing the molding press, naturally cooling and taking out to obtain the shell shown in figure 4.
(7) Electrolyte injection: placing the cured and molded shell in a glove box, and injecting electrolyte into the glove box; in this embodiment, the case body formed by curing is placed in a glove box, and the organic electrolyte DLC 301 is injected from the injection hole 10 under vacuum.
(8) Sealing and testing: after the electrolyte is injected, the liquid injection port is sealed, and an electrochemical workstation is used for testing the electrochemical performance of the liquid injection port; in the embodiment, after the liquid injection is finished, the liquid injection hole 10 is sealed by an explosion-proof plug in a glove box; the structural cell was then removed and tested for electrochemical performance using an electrochemical workstation.
Example 2
Unlike the preparation method of example 1, the current collector of this example uses 0.01mm nickelThe foil was vacuum-sealed at 25 ℃ with 4mol/L H2SO4Etching the solution for 30 min.
Example 3
Different from the preparation method of the embodiment 1, the embodiment adopts a porous PP diaphragm as an insulating diaphragm, and the positive electrode sheet 7, the negative electrode sheet 9 and the diaphragm 8 are wound into a cylindrical battery cell.
Example 4
Different from the preparation method of the embodiment 1, in the embodiment, the glass fiber prepreg is directly layered on the upper surface and the lower surface of the Z-shaped lamination direction formed by combining the battery core and the foam frame 12, and then the structural battery is prepared by mould pressing, curing and molding.
Example 5
Different from the preparation method of the embodiment 1, in the embodiment, the ion electrolyte is injected into the structural battery after the die pressing solidification through the injection hole 10, and then the ion electrolyte and the positive and negative electrode plates form the energy storage structural battery.
Example 6
Different from the preparation method in embodiment 1, in this embodiment, activated carbon on an electrode sheet is replaced by a metal oxide, so that the activated carbon and ions in an ionic electrolyte undergo an oxidation-reduction reaction to form pseudo-capacitor energy storage, and then a battery core is prepared.
Comparative example 1
Different from the preparation method in the embodiment 1, in the step (5), carbon fiber prepregs with different thicknesses, such as 0.05mm, 0.10mm, 0.20mm, 0.30mm and the like, are adopted to lay layers on the upper surface and the lower surface of a Z-shaped structure formed by combining an energy storage cell and a foam frame with the same thickness, and then the layers are molded, cured and formed, so that the prepared structural battery can bear the mechanical properties as shown in the following table 1 under normal operation.
TABLE 1 maximum bearing pressure of shells made of carbon fiber prepregs of different thicknesses
| Prepreg thickness (mm) | Energy storage property of battery | Withstand maximum pressure (N) |
| 0.02 | Good effect | 1200 |
| 0.05 | Good effect | 1100 |
| 0.10 | Good effect | 950 |
| 0.20 | Good effect | 750 |
| 0.30 | Good effect | 500 |
Comparative example 2
Different from the preparation method of the embodiment 1, in the step (5), in this embodiment, a shell is prepared by performing composite curing molding on a carbon fiber ultrathin prepreg with a thickness of 0.02mm and foam, and then the energy storage battery core is placed in the shell after curing of the carbon fiber and the foam, and is sealed after the electrolyte is injected inwards. The maximum pressure that the carbon fiber structure battery prepared in this way can bear compared with the maximum pressure that the carbon fiber structure battery can bear after being directly layered on the energy storage battery core is shown in table 2.
TABLE 2 maximum bearing pressure of the shells of the different forming methods
| Molding method | Prepreg thickness (mm) | Energy storage property | Withstand maximum pressure (N) |
| Spreading layer solidification directly on electric core | 0.02 | Good effect | 1200 |
| First solidified and then embedded into electric core | 0.02 | Good effect | 700 |
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A preparation method of a battery with an energy storage composite material structure is characterized by comprising the following steps:
(1) preparing electrode slurry: mixing the active material, the conductive agent and the binder according to the mass ratio of 9:0.5:0.5, and then adding the solvent and fully stirring to uniformly mix the active material, the conductive agent and the binder;
(2) coating: coating the uniformly mixed electrode slurry on a current collector to prepare a positive electrode plate and a negative electrode plate;
(3) drying, rolling and slicing: putting the coated positive electrode plate and negative electrode plate into a vacuum drying oven for drying, then rolling, and finally shearing into electrode plates with proper sizes;
(4) preparing an electric core: the positive electrode plate and the negative electrode plate are symmetrically arranged on two sides of the diaphragm, and the Z-shaped layers are laminated to form a battery cell which comprises the positive electrode plate, the negative electrode plate, the diaphragm, a positive electrode pin and a negative electrode pin;
(5) preparing a sandwich structure: preparing a shell by using prepreg and foam material, and then putting the prepared battery cell into the shell to form a sandwich structure;
(6) curing and forming: placing the assembled sandwich structure in a molding press for curing and molding;
(7) electrolyte injection: placing the cured and molded structure in a glove box and injecting electrolyte;
(8) sealing and testing: after the electrolyte is injected, the injection port is sealed, and the electrochemical performance of the electrolyte is tested by using an electrochemical workstation.
2. The method for preparing the battery with the energy storage composite material structure according to claim 1, wherein in the step (2), the current collector is 4mol/L H for aluminum foil or nickel foil with the thickness of 0.01mm2SO4Vacuum corroding in the solution at 25 deg.C for 30 min.
3. The method for preparing a battery with an energy storage composite structure according to claim 1, wherein in the step (2), the electrode slurry is coated on the current collector to a thickness of 50-300 μm.
4. The method for preparing the battery with the energy storage composite material structure according to claim 1, wherein the rolling pressure in the step (3) is 35 MPa.
5. The method for preparing the energy storage composite material structure battery according to claim 1, wherein the prepreg in the step (5) is a carbon fiber prepreg or a glass fiber prepreg.
6. The method for preparing the battery with the energy storage composite material structure according to claim 1, wherein the specific manufacturing method of the sandwich structure in the step (5) comprises the following steps: placing a rectangular frame around the prepared battery cell, wherein the thickness of the frame is equal to that of the battery cell in the Z-shaped lamination direction, and prefabricating a liquid injection hole in front of a foam frame; and then laying layers on the upper surface and the lower surface of the cell in the Z-shaped lamination direction by using 0.02mm carbon fiber prepreg to form an upper panel and a lower panel, wherein the upper panel and the lower panel are formed by combining the foam frame and the cell in the Z-shaped lamination direction by using the carbon fiber prepreg, so that the whole preform with a sandwich structure is formed.
7. The preparation method of the battery with the energy storage composite material structure according to claim 1, wherein the curing and molding in the step (6) comprises the following specific steps: placing the sandwich structure assembled in the step (5) on a molding press, and setting the pressure of the molding press to be 0.1 MPa; raising the temperature of the molding press to 85 ℃, and keeping the temperature for 10 min; and raising the temperature of the molding press to 120 ℃, preserving the heat for 15min, and taking out after the molding press is naturally cooled.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188639A (en) * | 2021-12-17 | 2022-03-15 | 南京航空航天大学 | Composite material modular battery structure, device and preparation method |
| CN115966652A (en) * | 2022-12-29 | 2023-04-14 | 上海交通大学 | Dot-matrix carbon fiber structure battery and preparation method thereof |
| CN115966652B (en) * | 2022-12-29 | 2024-10-25 | 上海交通大学 | Lattice type carbon fiber structure battery and preparation method thereof |
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